Method of locking printing strips in place



Nov. 29, 1927.

C. CHISHOLM METHOD OF' LOCKING PRINTING STRIPS IN PLACE Filed Aug. 14, 1925 2 Sheets-Sheet l ni fue, 122 avro zomslwsdc'rprin lpnnapaa sri bnn --amlnla ad?.

Twan-f E,

Nov. 29, 927.,

C. CHSHOLM METHOD OF LOCKING PRINTING SRIPSMIN PLACE Filed Aug. 14. 1925 N 4D 30 zo A frei-Vlad 5 2 Sheets-Sheet 2 CII Patented Nov. 29, 1927.

UNITED sra'ri-:sPATENT OFFICE..

CLIFTON CHISHOLM, OF CLEVELAND, OHIO, ASSIGNOR TO AMERICAN MULTIGRAYH ooivirANY, or

CLEVELAND. OHIO, A CORPORATION OF OHIO. l

METHOD OF LOCKING PRINTING STRIPS IN PLACE.

Application filed August 14, 1925. SeriaI No. 50,155.

the strips extending. beneath overhangingV portions of the buttons. This provides a very simple portable printing form.

It is desirable, however, that means be provided to prevent the strip shifting longitudinally on the holder. I have discovered that such movement may be readily prevented by giving its opposite edges a slight inward distortion, causing them to bind against the buttons or projections of the holder, and furthermore that such inward distortion may be entirely effective to prevent shifting without in any manner distorting the printing surface of the strip. My invention is concerned with this method of locking the printing strip in place.

rlhe drawings serve to illustrate the method. Fig. l is a cross-section through a rotary printing machine having a buttonblanket carrying embossed printing strips and illustrating the application of a tool for indenting the edges; Fig. 2 is a development of a portion of the surface of such printing device equipped with a flexible blanket and printing strips; Fig. 3 is a perspective of a portion of a holder or blanket, a strip thereon and a device for indenting thel edges of the strip; `cross-sections through strips and their blanket illust-rating the position of the stripbefore the indenting action takes place and after it is completed respectively; Fig. 6 is a perspective of one of the strips after 'its edges have been indented,-the amount of indentation being exaggerated for clearness of illustration. n

As rillustrated in Fig. l, 10 indicates-ti segment of a drum mounted on a rotary driving shaft 11 and adapted to carry a flexible sheet metal blanket 2O on which are mounted embossed printing strips 30, which when the drum rotates may cooperate with a suitable roller platen l5 to print-ink being supplied by any suitable means, not shown.

The blanket 2O is constructed iii accordance with Patents Nos. 1,438,584 and 1,438,-

Figs. 4 and 5 are enlarged 582 granted to The Americanv Multigraph .Company December 12, r1922, on applications of /Villiam J. Demming and Burnie J. Craig respectively. As clearly shown in Figs. 2 and, this blanket has rows of up-r standing buttons 21 connected in the direction of the row by upstaiiding corrugations 22. The tops of the corrugations andthe tops of the buttons come to the same plane along the central Zone of the buttons, but the arcuate edges of the buttons extend beyond the corrugations in each direction and overhang the body of the plate some distance above its main region, as illustrated in Figs. 3, 4, and 5. rlhus the buttons and iiitei-mediate corrugations form a continuous support for the embossed strips 30.

- The edges 3l of the embossed strips are curled inwardly` beneath the buttons to underhang them so that such strips may be slid eiidwise iiito place on the holder and thereafter will be retained against outward or radial movement. The strips' may lie close to each other as shown in Fig. 2.

The problem presented is to lock the strips against longitudinal displacementv of the holder, after they have been putin position. I have discovered that by inwardly indenting the opposite edges of the strip a slight amount, and for a distance at least asgreat erably made of comparatively soft material, as aluminum, for instance, and a slight edge indention suflces to force the metal against the edges of the adjacent button or Y buttons. .The degree of the indentation has been exaggerated in Figs. 2 and 6 for proposed clearness of illustration, but a coinparison of Figs. 4 and 5 illustrates the comparatively slight degree of distortion necessary tol be effective. 1

The distortion4 may be accomplished vby means of a suitable block placedv against the edge of the strip and the delivery of a comparatively light blow to this block. Such block preferably has inclined separated jaws engaging opposite edges of the strip so that an inward blow vis delivered to both edges at the same time by a blow Aoii the block directed normally to the course of the holder. It is important that thel indentation be at least as long as the distance from one button on the holder to the corresponding portion of the next button, so `that the strip will` notbe forced inwarlilly betweenv the buttons, which would distort the printing surface, `but simply against the ed ot one or more' buttons. A' block having such length of jawmay be placed at any point on the strip, since it is immaterial whetherit iorees the strip simply against the opposite edges of one but-ton, or. against theledgesfo'f two adjacent buttons.

-It-isiimportant:that the blow whiel1:i11 dents the edges be not excessive, 'otherwisethe stripwill-be distort-ed` in its printing region. =Accordingly, means are-y preferably provided foidelivering a blow otconstant force. I. iind that .it is desinable=to-provide the. hammer blo'clrwith a flat surtacewhich engages the face of. the character as the. bleek comes vto.-;its .final position, thus rflattening suehface ifi the blow has bowed the strip' up- Xvardlyto` any extent.

A suitable simplement for engaging' the edges of the=striplis illustra-ted in the drawing-:at `40. `,This@implement has spaced inwardly beveledfijaws .41 adapted to engage lthe opposite edges oflthe strip as illustrated in Figs.v 4- and 5. 42 in'iFig. 1 discloses a handle torthe implement which ymay receive a blow vextraneously: delivered, though l preH Afer to employ aninternal spring` 43 and a hammer 44 which is .automatically released whenthe-springisicompressed to deliver a constant blow: to the hammer. bloclr 40.

An internal mechanism for effect-ing a con- :stant blow :isfillnstrated in =1ny application 1Nofr739,946 tiled' September '25, 19524,- `of which the 1 present `appl ieat-ion is a continuation inwpart. vThe implement therewde` :scribed is advantageous in that it v.may be ,simply placed against the strip )and the. handle forcedinwardly manually and blows of constantforce delivered by means of.=anwin yternal spring and hammer, andI excessive -blows avoided.

'NVfhetheri the blow iscleliveredA by :an inter- -Ial .Spring :ory by yexternal f means :impinging 'the handle, ptheymay be rapplied v'after tthe strips are-niounted Von the holder,l Land Aas shown in Fig. 1,may be radially :delivered after the holder with. the strips is mounted ,on

ran areuateframevon a printing drum.

. VMy invention provides a very simple. :and effective means for locking the strips against longitudinal shifting on :their holder .an d is :.equallyrapplicable whether the 'strips be mounted close together, as.'l"or printing Single space, oinwhether they arefmoun-ted some distance apart. `The wfidtl'i and .depth of the `groove inthe lblock betweenJthe-jan-*s 4l is suliicientto clearithe .embossed characters on the strip when the tool isiiirst vapplied, the bottom ofthe groove being pret erably flat a suitable :distance above the characters as `illustrated in Fig. 4. The .depth of this groovebeafrs .such relation to the Aangular inclination, that. when the proper amount of indentation to the edges of the strip has been made, the base of the groove impinges the face of the characters beneath Vit andthus immediately restoresthis aee'to a flat plane,"i:f the indentation ot the edges distorted it. It'fthe-internal spring arrangement of tool shown in F ig. l is employed, it ,iste-.tbe understoodthat the spring has force enough to cause the hammer block to take the'position shown in F ig. 5.

i Having thus described my, iinventfion, l claim l. The method of binding a flangedfprintling strip .on a holder having afroworaise'd project-ions which the stripV over'liespfcomprising indentingthe edge` .of thestrip .'forfa distance at least -as'great .ias fthat ifro'mione projection to the corresponding portion of the adjacent projection.

2.; rIhe :method ot' Vbinding. a flanged; .print-- ing strip on a hol-der having a row :otraised projections which the istrip overlies Vand=be v neath 'the ledges oi: which its flanges extend comprising indenting opposite.edgesrotthc t strip for a distance at leastras great ,ast-hat .trom :one 1 roection to 'the corres ending` l n n i. l",

1 )ortion otithe adacent aro eetion.

. lhe'method ot binding a flanged: printingstrip on a holder, having a row o'fiaised buttons which the strip overlies'andbeneath `the edges of which its flanges extend com- -prising `simnltaneously indenting the oppo` site edges of the strip/for aY distanceatleast as great as Cthat' 4from one :button :tof the corresponding portionrof the adjaeentbutton` by? the :delivery-'tothestrip of ablow ot definite amount. l

4. The method of binding.tlangedrprintingstrips on. Aa .holder having. rows of: raised projections which therstrips'overliel andnbeneat-h the edges' of which itsIanges'eXtend, comprising indenting" the opposite 'edges or" rthe striprsimultaneously for a distaneenat -least as `great `asthat from one projection'to fthe corresponding Aportionkof thex adjacent 'biiolection by means of a:blowideliveredin a direction normal'to the surface ofi-the Vstrip -fon members `which lie in aninclinedldireen tion in engagement, with'- opposite l edges "of the strip.

5. The method 01' .binding'iiangedprint' ing strips on a holder having rows of =Lraised 'projectionswhich the strips #overlieland beneath the edges of whichft'heir' flanges Iextend n comprising simultaneously indenting -by a -sin'gle blowpthe dopposite edges cfa/strip tor aV distance at least-as great Las thatfvfroni one projection` to the=eorresponding portion of the adj acent projection, and repeating this operation for diierent strips,lthe'toreesiof the blows on theV difli'erent strips .beingzthe same. Y

6. The method of binding a printing strip on aholde'r lhaving alraised Aprojection which the strip overlies, comprising simultaneously indenting the opposite edges of the strip while it is mounted on the holder and as the indentation is being completed flattening any upwardly bowed character between the indentations.

7. The method of binding a flanged printing strip on a holder having a row of raised projections which the strip overlies and beneath the edges of which its flanges extend comprising indenting opposite edges of the strip for a distance at least as great as that from one projection to the corresponding portion of the adjacent kprojection and at the completion of the indentation pressing a plane surface against the face of the characters. n

.8. The method of binding a printing strip ona holder having a row of spaced raised projections which the strip overlies, comprising indenting the edge of the strip for a distance less than its length while it is mounted on the holder in a manner to'in, sure a projection being engaged' by an indentation. j Y 9. The lmethod of binding a flanged sheet metal printing strip on a holder having a row of raised projections on which thexstrip rests and beneath which its flanges project, comprising indenting the fiange in a manner which will insure the engagement of a projeotion by an indentation, though the indenting tool may be variably positioned with reference to the strip.

10. The method of binding a flanged sheet metal printing strip on ay holder having a row of raised projections on which the strip rests and beneath which its fianges project, comprising indenting both flanges for a distance less than the length of the strip and in a manner which will insure the engagement f of the opposite edges of the same projection.

' ll. The Amethod of binding a flanged printing strip on a holder having a raised projection which the strip overlies, comprising indenting the edge of the strip for a distance materially less than the length of the flange while itl is mounted on the holder and while using theholder as an anvil to cause the strip to bind against the edge of the projection. 1

12. The method of binding parallel adjacent printing strips on a holder having rows of raised projections which the stripsoverlie, comprising indenting the o posite edges of previously formed flanges o? different strips in isolated regions to bring such regions farther in than the most of the flange, while the strips are mounted on the holder to cause them to bind against the edges of the raised projections.

In testimony whereof', I hereunto aiiiX my signature.

' CLIFTON CHISHOLM. 

